Timothy J. DellIBM Systems and Technology Group, 1000 River Street, Essex Junction, Vermont 05452 (timdellus.ibm.com). Mr. Dell is a Senior Engineer working with the Memory Subsystem Development and Architecture team, with a focus on the modeling and use of error-correcting codes to improve the RAS of computer and communication systems. He holds B.E.E.E. and M.E.E.E. degrees from Rensselaer Polytechnic Institute. Mr. Dell has been involved in memory and logic card design, application-specific integrated circuit applications, and RAS architectures at IBM since 1981. He holds 49 U.S. patents.